You are about to promote a server running the Windows Server 2012 R2 operating system to
domain controller. The domain is currently running at the Windows Server 2008 domain functional
level. Your account is a member of the Domain Admins group.
Which additional groups should your account be a member of to ensure that the environment is
appropriately configured for this domain controller running Windows Server 2012 R2? (Choose
two. Each answer forms part of a complete solution.)
A.
Schema Admins
B.
Enterprise Admins
C.
Account Operators
D.
Server Operators
https://technet.microsoft.com/en-us/library/jj574178.aspx
Active Directory forest schema extension and domain preparation now integrate into the domain controller configuration process. If you promote a new domain controller into an existing forest, the process detects upgrade status and the schema extension and domain preparation phases occur automatically. The user installing the first Windows Server 2012 domain controller must still be an Enterprise Admin and Schema Admin or provide valid alternate credentials.